Python program to find area of circle

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As we know how find the circle area mathmatically because in this programing tutorial we are going to use simple maths formula of circle area.

Area = 3.14*Radius*Radius

It means we have to take one parameter from the user to find the area of a circle and that parameter is the radius.

Area-Of-Circle

 

Method-01

Using Function and math library.

import math
def findArea(r):
    areaOfCircle = math.pi* pow(r,2)
    return areaOfCircle

radius = float(input("Enter Radius: "))
area = findArea(radius)
print("Area Of Circle: ",area)

Output:

Enter Radius: 2
Area Of Circle:  12.566370614359172

 

Method-02

Using simple python and maths expression.

radius = float (input ("Enter Radius: "))  
area = 3.14 * radius * radius  
print (" Area Of Circle: ", area)

Output:

Enter Radius: 2
Area Of Circle:  12.566370614359172

 

Method-03

Using simple python and direct area formula.

radius = float (input ("Enter Radius: "))  
print (" Area Of Circle: ", 3.14 * (radius**2))

Output:

Enter Radius: 2
Area Of Circle:  12.566370614359172

 

Method-04

Using class and object concept.

class circleArea:
    def __init__(self, radius):
        self.radius = radius
    def area(self):
        return 3.14 * (self.radius ** 2)
        
r = float (input ("Enter Radius: ")) 
circle1 = circleArea(r)
print("Area of circle:",circle1.area())

Output:

Enter Radius: 2
Area Of Circle:  12.566370614359172

 

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